#include "stdio_impl.h"
#include <string.h>
#include <signal.h>
#include <errno.h>

void psignal(int sig, const char *msg)
{
    FILE *f = stderr;
    char *s = strsignal(sig);

    FLOCK(f);

    /* Save stderr's orientation and encoding rule, since psignal is not
     * permitted to change them. Save errno and restore it if there is no
     * error since fprintf might change it even on success but psignal is
     * not permitted to do so. */
    void *old_locale = f->locale;
    int old_mode = f->mode;
    int old_errno = errno;

    if (fprintf(f, "%s%s%s\n", msg?msg:"", msg?": ":"", s)>=0)
        errno = old_errno;
    f->mode = old_mode;
    f->locale = old_locale;

    FUNLOCK(f);
}
